What is the purpose of the 'front' pointer in an array implementation of a queue?
It tracks the total number of elements in the queue.
It points to the element that has been in the queue the longest.
It points to the next available empty location.
It points to the most recently added element.
What is the maximum number of elements a circular queue of size 'n' can hold?
n
n - 1
n + 1
It depends on the implementation
Which of the following operations on a queue does NOT have a time complexity of O(1) in a standard implementation?
isEmpty
Dequeue
Searching for a specific element
Enqueue
When would it be more advantageous to use a linked list implementation of a queue over an array-based implementation?
When the maximum number of elements in the queue is known in advance.
When dynamic resizing and the potential for overflow are concerns.
When dealing with a small, fixed number of elements.
When memory usage needs to be tightly controlled.
What is the primary difference between a queue and a stack?
Queues use FIFO (First-In-First-Out), while stacks use LIFO (Last-In-First-Out).
Queues are linear data structures, while stacks are non-linear.
Queues use LIFO (Last-In-First-Out), while stacks use FIFO (First-In-First-Out).
Queues store numbers, while stacks store characters.
Which of the following real-world scenarios can be effectively modeled using a queue?
Implementing an undo/redo functionality in a text editor.
Managing a priority-based task list.
Storing the browsing history in a web browser.
Handling customer service requests in a first-come, first-served manner.
In a circular queue implemented using an array of size 5, the front is at index 3, and the rear is at index 1. What happens after two dequeue operations?
The front moves to index 1, and the rear moves to index 4.
The front moves to index 0, and the rear moves to index 4.
The queue becomes empty.
The front moves to index 0, and the rear remains at index 1.
What data structure is used to implement a priority queue?
Stack
Linked List
Heap
Array
What is the main advantage of using a circular array for implementing a queue compared to a regular array?
Better handling of sorted data
Reduced memory consumption
Efficient utilization of space after multiple enqueue and dequeue operations
Faster access to individual elements
What is the time complexity of enqueue and dequeue operations in a well-implemented array-based queue?
O(log n)
It depends on the size of the array.
O(1)
O(n), where n is the number of elements in the queue.